Heat exchanger



Nwv. M 1924 C. F. SUTER HEAT EXCHANGER Filed Nov. 17, 1923 2 Sheds-Sheet l INVENTOR: 85 {Jim ATTORNEY;

W, H 9 19246 ama? C. F. SUTER HEAT EXCHANGER Filed Nov. 17 92 2 Shawna-Sheet 2 INVENTOR:

WW/zed KM A TTORNEY.

atented Nov. ll, 1924.

NITED STATES PATE O'FFlCE.

HEAT EXCKANGER.

Application filed November 17, ,1921. Serial No. 515,944.

To all whom it may concern:

Be it known that I, CHARLES F. SUTER, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Heat Exchanger, of which the following is a specification, reference being had to the accompanyin ters and figures 0 reference marked thereon.

This invention relates to devices whereby to obtain heat or cold from the walls of chambers or conduits, and has reference more particularly to an appliance whereby to obtain heated air for useful purposes.

An object of the invention is to provide a heat exchanger whereby the maximum benefits may be derived from the walls of heated chambers or conduits to be used for various purposes, or whereby the temperature of liquid or fluid passing through conduits may be changed.

Another object is to provide means whereby the maximum heat may be obtained for heating an apartment from a heating stove with consequent economy in the consumption of fuel.

A further object is to provide'a heat exchanger which may be adapted for advantageously and economically obtaining and conducting away heat from the surface of a heated wall. 7

A still further object is to provide a heat exchanger which shall be adaptable for obtaining heat from an explosion engine and heating atmospheric air thereby and conducting the product to a carbureter.

With the above-mentioned and other ob jects in view, the invention consists in a device having a multiplicity of channels adapted to induce the flow of air and having small orifices or outlets adapted to direct thin currents of air to heated surfaces to be rapidly heated and having an outlet for the heated air; and, the invention consists also further in the novel parts and in the combinations and arrangements of parts as hereinafter particularly described and further defined 1n the accompanying claims.

Referring to the drawings, Figure 1 is a front elevation of an ordinary heating stove to which the invention in one of its forms is applied; Fig.2 is a section on the line II-II in'Fig. 1; Fig. 3 is a sectional elevation of the heat exchanger shown in the precedin figures, taken approximately on the line HIII in Fig. 2; Fig. 4 is a fragdrawings and to the let-,

mentary section approximately on the line IVIV In Fig. 1, on' an enlarged scale;

Fig. 5 is a sectional elevation approximately on the line VV in Fig. 4; Fig. 6 is a fragmentary elevation approximately on the'line VI-VI in Fig. 4; Fig. 7 is a longitudinal central section of the heat exchanger as applied to a heating chamber or pipe and slightly modified to permit forced flow of air through the exchanger; Fig. 8 is a top plan of the exchanger as shown in the preceding figure and partially broken away, the pipe being in transverse section; Fig. 9 1s a side elevation of an explosion engine shown by broken lines and having an exhaust manifold to which the invention is applied for supplying heated air to the carbureter associated with the engine; Fig. 10 is a transverse section of the exhaust manifold and a portion of the heat exchanger; Fig. 11 is an elevation of the rear or inner side of the heater exchanger adapted for use on the manifold; Fig. 12 is a longitudinal central section of a tubular electrical heater provided with theheat exchanger, slightly modified; and, Fig. 13 is a section approximately on the line XIII-XIII in Fig. 12.

Similar reference characters in the different figures of the drawings indicate corresponding or like elements or features of construction herein referred to in detail.

In the drawings, the numeral 1 indicates the fire pot and 2 the wall of the heating chamber of a common type of heating stove. The heat exchanger when designed to be used on a stove or a heated pipe or conduit, comprises a casing or outer wall 3 which is larger in diameter than the wall 2 and in some cases may be continuous, but, as shown, it has a gap and end, walls 4 and 5 extending inward to the wall 2, permitting free access to the firing door of the stove. Thus a chamber is provided between the walls 2 'and 3 in'which a novel heat exchanger device is arranged, the device being composed of metal and suitably fluted or corrugated so as to have transversely curved main portions 6 and relatively narrow channels 7, the side walls of the channels being relatively convergent and joined together so that each channel has a narrow bottom 8. The convex faces of the main portions 6 are presented towards the wall 8, and the bottoms 8 are positioned relatively close to the wall 2, and each channel bottom has a longitudinal slit 9 therein to direct air in a gine.

thin current directly to the heated wall. The outer chamber that is formed between the wall 3 and the partitional wall has a top closing the upper end of the chamber so that the air passing through the slits must enter and pass out the conduit formed between the partitional wall and the wall 2, the larger portions of the conduit being behind the ourved portions (3. The conduit has a bottom 11 that extends from the partition to the heating chamber wall 2. In this case the air enters the outer chamber and after passing through the slits is conducted upward through the conduit or inner chamber.

When the exchanger is designed to be connected with a pipe or conduit 2 it is constructed asabove described excepting that it may be made continuous so as to extend entirely about the pipe, as seen in Fig. 8; and when it is desired to cause forced flow of air through the exchanger the lower end of the outer chamber has a bottom 11 therein and the chamber receives the air through a conduit 12 connected with the chamber adjacent to the lower portion thereof, substantially as shown in Figs. 7 and 8.

By reference to Fig. 9 an explosion engine shown by broken lines will be readily distinguished, the engine having an exhaust manifold 13 provided with an ex haust pipe 14, a carburetor 15 having an air inlet 16 being associated with the en- The exchanger is slightly modified as to contour and minor details to adapt it to the exhaust manifold, the exchanger being shaped so as to'receive heat from the outer side and the top of the manifold, and the outer wall or casing above described may be omitted; in this case the exchanger portion has curved main wall portions 17 arranged with their concave sides facing the manifold wall, there being channel walls 7 connected with the main portion 17 and channel bottoms 8 having the slits 9 therein. The exchanger device has a back wall 18 and end walls 19 and 20 enga ing the wall portions of the exhaust manifold, the conduit behind the curved portions 17 conducting the heat obtained from the manifold to a box 21 formed in connection with the end wall 20 and having a conduit 22 connected therewith that is connected with the air inlet 16 of the carbureter.

In some cases the heat exchanger is applied to the inside of conduits or tubes, as illustrated in Figs. 12 and 13 in which a hollow cylinder 23 of suitable material has an electrical resistance coil 24 therein, the exchanger being arranged within the cylinder and having curved main wall portions 25 arranged with the concave side towards the cylinder wall, there being channels 7 alternating with the curved main portions,

the bottoms 8 of the channels having slits 9 therein to direct air to the heated wall, the exchanger wall having a top 26 thereon to compel the air'to go through the slits. The conduit or chamber adjacent to the wall 23 has a bottom 27 to prevent the atmospheric air from entering the bottom of the chamber.

In practical use the air passes along the channels 7, the volume of air being contracted in the channels to thin currents which flow through the slits 9 to the surface of the heated chamber or pipe. The thin currents are rapidly heated, and becoming expanded into the chamber or conduit behind the curved' portion 6, the. air rapidly rises and becomes further heated in its passage out of the conduit, and obviously the resultant heated air may be conducted away for various purposes.

As the exchanger is applied to a stove or a pipe the atmospheric air enters the lower portion of the chamber between the wall 3 and the exchanger wall, thence through the slits and thence out of the upper portion of the conduit between the exchanger will and the wall .2. When the exchanger is designed for the interior of a pipe or heater the atmospheric air enters the lower portion of the opening in the lower portion of the heater and passes outward through the slits and thence upward and outward through the outer chamber. When the exchanger is applied to an explosion engine the suction through the carbureter draws air through the conduit 22 and consequently draws the air inward through the slits to the heated Wall of the exhaust manifold. It will be seen from the foregoing that in stead of utilizing merely radiated heat the air is caused to flow rapidly against heated surfaces which rapidly heat the air, so that rapid flow of air is induced through the outlet ducts or conduits, resulting in the extraction of the maximum amount of heat or volume of heated air with consequent economy of fuel consumption.

When a conduit is conducting cold liquid or air the temperature of atmospheric air passing through the exchanger is lowered and may be useful for tempering the air in dwellings or other rooms. The exchanger device is useful also in other situations than those described, particularly in their relation to heating and ventilation and also in refrigeration.

Having thus described the invention, what is claimed as new is:

1. A heat exchanger having a multiplicity of channels, portions of the walls of the channels having narrow slits therein to direct air in thin currents from the channels. 2. A heat exchanger including a wall having a plurality of channels in one side thereof, the bottom of each channel having a changer wall having a remainder of the channel and provided with longitudinal slit therein, there being a conduit on the opposite side of the wall having wall portions arranged closely opposite to the slits.

3. A heat exchanger including an exchanger wall having a lurality of groove-like channels in one si e and a plurality of groovelike conduit portions in the opposite 'side' ber between the walls, the exchanger wall having a plurality of longitudinal channels in the farther side thereof, each channel being provided with a relatively narrow bottom havin a longitudinal slit therein, the bottoms being positioned near to the chamber wall, and a conduit connected with the chamber.

5. A heat exchanger including a conduit wall, an exchanger on the outside of the conduit wall comprising a wall providing a conduit between the walls, the chamber having a closure in one end-thereof, the explurality of longitudinal channels in-the side thereof the farther from the conduit wall, each channel having a bottom that is narrower than the a longitudinal slit, the bottom being located in close relation to the conduit wall.

6. A heat exchanger including a conduit wall, a casing wall extending outside the conduit wall at a distance therefrom, an exchanger wall arranged between the walls and with the casing wall forming an inlet chamber and with the conduit wall forming an outlet conduit, the exchanger wall having a multitude of longitudinal channels in the side thereof towards the casing wall, the side walls of each channel being convergent each towards the other and extending near- 1 ly .to the conduit wall, each channel having a narrow bottom connected to the side walls and located closely opposite to the conduit wall, the'bottom having a longitudinal slit therein, the inlet chamber having an end vclosure connected with the casing Wall and one end of the exchanger wall, and the outlet .conduit having an end closure connected with the conduit wall and the opposite end of the exchanger wall.

7. In a heat exchanger, the combination with a conduit wall, of controlling means to divide an air current into separate thin currents and direct thin currents simultaneously to intimate contact with difierent portions of the wall, and means including the conduit wall for receiving and combining the currents and directing a flow away from the controlling means.

8. In a heat exchangen'the combination with a conduit Wall, of controlling means to divide an air current into extremely thin and broad currents and direct the currents simultaneously to intimate contact with different portions of the wall, means to conduct a flow of air to the controlling means, a combiner to receive and combine the thin currents into a single current, and a conduit connected with the combiner to forcibly conduct the single current away from the combiner.

9. In a heat exchanger, the combination with a conduit wall, of controlling means to divide an air current compressedly into separate thin currents and direct thin currents simultaneously to intimate contact directly with different portions of the wall, means to conduct an undivided current to the controlling means to be thereby divided and compressed into. the thin currents, and means including the conduit wall for expan sively receiving and combining the thin currents and directing a flow away from the controlling means.

10. In a heat exchanger, the combinationof a wall having a plurality of channelsfin one side thereof, each channel being provided with a bottom having a longitudinal slit therein, theopposite side of the wall having a plurality of conduit portions that are broader than the channels and arranged alternatively with the channels, with means behind the bottoms of the channels to change the temperature of currents passing from the channels through the slits. In testimony whereof, I affix my signature in presence of two witnesses.

. CHARLES F. SUTER.

Witnesses:

E. T. SILVIUS, ROBERT LIEBRIOH. 

